stalling..over fueling. gx71 crusader-1geu

[YeMs]

hey iv got a gx71 cressida with a 1geu. i just put the motor in last weekend (due to the old motor being fried... blown headgasket, and they kept driving it, got so hot the ht leads melted to the plugs/block lol) any way went mint on monday and tuesday then started like stalling, dropping revs for no reason. now it wont start atallbut smokes (blue smoke, very very fuely smelling) . has good compression (150psi even on all 6 cylinders) i have replaced the intake manifold gasket to be sure its not leaking. it has good spark, and good fuel pressure. are all these symptoms pointing to a crook air flow metre? is definately seriously over fueling wen trying to start it, if i remove the efi relay it will actually start and run on the remaining fuel in the chamber for a couple of seconds. a work mate had a theory that the injectors mite b f*cked but it seems unlikely that they would be mint for 2 days then all of a sudden all 6 stop working and just blow fuel in.

i guess all im asking for is a few different opinions of the issue? what u think the problem may be.

oh also the problem first started with the car would idle fine, but the second u touched the throttle the engine would die.

[Low_Aa63]

try checking the earth on the injectors perhaps? its a comon mistake but alot of people still manage to forget about it!

[YeMs]

over fueling.. not under fueling. and yeh the injector earths are definately on.

[pervert]

That sounds really similar to what my MTEU in a Cressida does when you try and start it with the $&#$% AFM, if that is any help.

[Boldy]

you should be able to start it with the AFM unplugged, the EFI computer won't actually use the AFM reading at idle. It should idle ok but you won't be able to go anyway, soon as there is load on the engine it will die.

Does the timing check out?

[pervert]

you should be able to start it with the AFM unplugged, the EFI computer won't actually use the AFM reading at idle. It should idle ok but you won't be able to go anyway, soon as there is load on the engine it will die.

Nah, it won't idle either on mine...and it is 100% definately the AFM.

[spencer]

They do use the afm reading at idle

[Toymad]

A lot of the Mk III Supras suffer this problem when the temperature sensor fails. It sees the engine as cold so injects more fuel. Note that this is the temperature sensor for the ECU; they use another sensor for the temp gauge in the dash.
I had it happen to me; at anything off idle it would die. Replacing that sensor did fix it, immediately.
It may not be the fault but it is something else to consider.

[Boldy]

you should be able to start it with the AFM unplugged, the EFI computer won't actually use the AFM reading at idle. It should idle ok but you won't be able to go anyway, soon as there is load on the engine it will die.

Nah, it won't idle either on mine...and it is 100% definately the AFM.

I didn't think the AFM was used when the TPS was in the idle position, there was a default map that the ecu looked at. Could be wrong tho, sold the workshop manual along with the car a few months so meh.

Mine used to idle without the afm plugged in I remember cause I had forgotten to plug it back in tinkering around one day. It took me 20 mins to try and figure out why the thing was cutting out whenever I put it in drive, but would start in P or N.

anywho doesn't matter none, ah fond memories of the cressida tho!!!

[Jebus]

A lot of the Mk III Supras suffer this problem when the temperature sensor fails. It sees the engine as cold so injects more fuel. Note that this is the temperature sensor for the ECU; they use another sensor for the temp gauge in the dash.
I had it happen to me; at anything off idle it would die. Replacing that sensor did fix it, immediately.
It may not be the fault but it is something else to consider.

A $&#$% thermo sensor or broken wire to the switch will cause exactly the symptoms you described. On a 4AGE the plug is green and on the rear of the head. Not entirely sure about the cressidas however. Definately give that a go.